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Lettice LA, Purdie LA, Carlson GJ, Kilanowski F, Dorin J, Hill RE.Lettice LA, et al.Proc Natl Acad Sci U S A. 1999 Aug 17;96(17):9695-700. doi: 10.1073/pnas.96.17.9695.Proc Natl Acad Sci U S A. 1999.PMID: 10449756Free PMC article.